Symptoms: Peanut root rot can occur in all stages of peanut growth. Pre-emergence infection after peanut sowing can cause rotten seed and rotten buds; damage caused by seedling stage causes root rot and seedling blight; damage caused by adult plants causes root rot, stem rot and rot, and the upper part of the diseased plant has short stature and poor growth. The leaves turned yellow and eventually the whole plant withered. When it is wet, the diseased part produces pink mold, which is a conidium of the pathogen.
Second, prevention and control: 1, selection of disease-resistant varieties, sowing seeds before sowing, remove color, rotten, damaged seeds, sowing 50% tetrachlorophenyl hydrazine wettable powder dressing, or 50% carbendazim WP mix Species, seed disinfection. 2, a reasonable rotation, deep turning to improve soil. 3, do a good job of fertilizer and water management, timely drainage after the rain ditching wet; pay attention to the use of fully decomposed manure, appropriate application of phosphorus and potassium fertilizer, promote plant robust and enhance disease resistance. 4. Combine ploughing before planting, spraying 5,000 times 96% perchlorate with 50 kg of Hymexazol, or spreading 70% of dexamethasone WP 2.5 kg, or 70% of metalaxyl MnZn 2.5 kg. Elimination of residual pathogens in the soil. If the disease has already begun, use 30% Hytrate Water 1000x, 70% Thiophanate 800x, 50% Supercarbendox 500x, 50% Propionin 1000x, 70% Cosmos 1000 times solution or 23% coloammite 400 times spray control, once every 7-10 days, even spray 2-3 times, spraying carefully pay attention to the root, stem base, ground.
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